Created Unassigned: Upgrade install failing [7967]

I encountered two errors while upgrading.

1. System.Data.SqlClient.SqlException (0x80131904): Table 'CKEditorProviderSettings' already has a primary key defined on it.
1. System.Data.SqlClient.SqlException (0x80131904): Violation of PRIMARY KEY constraint 'PK_CKEditorProviderSettings'. Cannot insert duplicate key in object 'dbo.CKEditorProviderSettings'. The duplicate key value is (DNNCKT#119#AllowedContent).

I have this with v2.1.0 and v2.1.1 beta

I worked around it by clearing the table and removing the installed primary key.
But you should have a look at it.